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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| import 'package:flutter/foundation.dart'; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:flutter/scheduler.dart'; | ||
|
|
||
| class FloatingTile extends StatefulWidget { | ||
| const FloatingTile( | ||
| {super.key, | ||
| required this.child, | ||
| this.initialPosition = Alignment.topRight}); | ||
| final Alignment initialPosition; | ||
| final Widget child; | ||
|
|
||
| @override | ||
| State<FloatingTile> createState() => _FloatingTileState(); | ||
| } | ||
|
|
||
| class _FloatingTileState extends State<FloatingTile> { | ||
| late OverlayEntry entry; | ||
|
|
||
| @override | ||
| void initState() { | ||
| WidgetsBinding.instance.addPostFrameCallback((_) => addOverlay()); | ||
| super.initState(); | ||
| } | ||
|
|
||
| @override | ||
| void dispose() { | ||
| if (kDebugMode) { | ||
| print("Floating tile is being diposed!"); | ||
| } | ||
| entry.remove(); | ||
| super.dispose(); | ||
| } | ||
|
|
||
| void addOverlay() { | ||
| if (kDebugMode) { | ||
| print("added floating tile overlay"); | ||
| } | ||
| entry = OverlayEntry(builder: buildOverlay); | ||
| Overlay.of(context).insert(entry); | ||
| } | ||
|
|
||
| Widget buildOverlay(BuildContext context) { | ||
| var size = MediaQuery.of(context).size; | ||
| var padding = MediaQuery.of(context).padding; | ||
| return TileOverlay( | ||
| initialLayoutSize: Rect.fromLTWH(0, 0, size.width, size.height), | ||
| safeAreaPadding: padding, | ||
| child: widget.child, | ||
| ); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return Container(); | ||
| } | ||
| } | ||
|
|
||
| class TileOverlay extends StatefulWidget { | ||
| const TileOverlay( | ||
| {super.key, | ||
| required this.child, | ||
| this.initialPosition = Alignment.topRight, | ||
| this.initialLayoutSize = Rect.zero, | ||
| this.safeAreaPadding = EdgeInsets.zero}); | ||
| final Rect initialLayoutSize; | ||
| final EdgeInsets safeAreaPadding; | ||
| final Alignment initialPosition; | ||
| final Widget child; | ||
| @override | ||
| State<TileOverlay> createState() => _TileOverlayState(); | ||
| } | ||
|
|
||
| class _TileOverlayState extends State<TileOverlay> { | ||
| Offset offset = const Offset(0, 0); | ||
| Offset startPosition = const Offset(0, 0); | ||
|
|
||
| GlobalKey childKey = GlobalKey(); | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
|
|
||
| switch (widget.initialPosition) { | ||
| case Alignment.topRight: | ||
| offset = Offset(widget.initialLayoutSize.width, 0); | ||
| break; | ||
| case Alignment.bottomLeft: | ||
| offset = Offset(0, widget.initialLayoutSize.height); | ||
| break; | ||
| case Alignment.bottomRight: | ||
| offset = Offset( | ||
| widget.initialLayoutSize.width, widget.initialLayoutSize.height); | ||
| break; | ||
| case Alignment.topLeft: | ||
| offset = Offset.zero; | ||
| break; | ||
| } | ||
|
|
||
| offset = getNearestPoint( | ||
| offset, Offset.zero, widget.initialLayoutSize, widget.safeAreaPadding); | ||
|
|
||
| SchedulerBinding.instance.addPostFrameCallback(postFrameCallback); | ||
| } | ||
|
|
||
| void postFrameCallback(_) { | ||
| updatePoint(offset); | ||
| } | ||
|
|
||
| Offset getNearestPoint( | ||
| Offset currentPos, Offset size, Rect bounds, EdgeInsets safeAreaPadding) { | ||
| var p = 10.0; | ||
|
|
||
| var rect = Rect.fromLTRB( | ||
| bounds.left + p + safeAreaPadding.left, | ||
| bounds.top + p + safeAreaPadding.top, | ||
| bounds.right - p - size.dx - safeAreaPadding.right, | ||
| bounds.bottom - p - size.dy - safeAreaPadding.bottom); | ||
|
|
||
| var points = [ | ||
| Offset(rect.left, rect.top), | ||
| Offset(rect.right, rect.top), | ||
| Offset(rect.left, rect.bottom), | ||
| Offset(rect.right, rect.bottom) | ||
| ]; | ||
|
|
||
| var minDistance = 9999999999.0; | ||
| var pos = currentPos; | ||
| for (var point in points) { | ||
| var dist = (point - currentPos).distance; | ||
| if (dist < minDistance) { | ||
| minDistance = dist; | ||
| pos = point; | ||
| } | ||
| } | ||
|
|
||
| return pos; | ||
| } | ||
|
|
||
| void updatePoint(Offset currentPoint) { | ||
| var size = MediaQuery.of(context).size; | ||
|
|
||
| var childSize = childKey.currentContext?.size; | ||
| if (childSize == null) { | ||
| return; | ||
| } | ||
|
|
||
| var point = getNearestPoint( | ||
| currentPoint, | ||
| Offset(childSize.width, childSize.height), | ||
| Rect.fromLTWH(0, 0, size.width, size.height), | ||
| widget.safeAreaPadding); | ||
|
|
||
| if ((point - offset).distance > 1) { | ||
| setState(() { | ||
| offset = point; | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| SchedulerBinding.instance.addPostFrameCallback(postFrameCallback); | ||
| return NotificationListener( | ||
| onNotification: (SizeChangedLayoutNotification notification) { | ||
| return false; | ||
| }, | ||
| child: AnimatedPositioned( | ||
| left: offset.dx, | ||
| top: offset.dy, | ||
| duration: const Duration(milliseconds: 300), | ||
| curve: Curves.easeOutCubic, | ||
| child: GestureDetector( | ||
| onPanUpdate: (details) { | ||
| setState(() { | ||
| offset = details.globalPosition - startPosition; | ||
| }); | ||
| }, | ||
| onPanStart: (details) { | ||
| startPosition = details.localPosition; | ||
| }, | ||
| onPanEnd: (details) { | ||
| var pos = offset + details.velocity.pixelsPerSecond; | ||
| updatePoint(pos); | ||
| }, | ||
| child: Container(key: childKey, child: widget.child))), | ||
| ); | ||
| } | ||
| } |
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